fix(mhfu-port): a ported PMO's clip is its largest scale component

[sp00ktober]

A ported monster no longer vanishes while it is still on screen.

• The cull: the engine tests a sphere against the view frustum.
  • Its radius is max(ENTITY.RENDER_SCALE) × PMO.clip, the PMO header at +0x0C.
  • Its centre sits half a scale.y above the entity's position.
  • Every MHFU model sets clip to its largest scale component.
• The bug: mhfu-port wrote 0, so a port was culled as a point just above its feet. Near the camera, the whole model vanished while its back was still in frame.
• The fix: mesh.build writes max(scale), which is 608.34 for the Zinogre. Only header bytes 0xC–0xF change; the four golden digests are updated for that.

Live in lane 3: a 0.3-size Zinogre NPC at the same pose, moved toward the camera.

• clip 0: culled from 140 xz / 299 3D units from the eye;
• clip 608: drawn down to 20 xz / 234 3D, by which point it has left the frame.

This applies to quest ports too. A port picks it up when it is re-injected (mhfu-port inject).

Tests: mhfu-port, mhp-formats and studio pass with both games' data, and pre-commit is clean.

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